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For compound pages, the head sets the PG_head flag and the tail sets the compound_head to indicate the head page. If a user allocates a compound page and frees it with a different order, the compound page information will not be properly initialized. To detect this problem, compound_order(page) and the order argument are compared, but this is not checked when the order argument is zero. That error should be checked regardless of the order. Link: https://lkml.kernel.org/r/20231023083217.1866451-1-hyesoo.yu@samsung.com Signed-off-by: Hyesoo Yu <hyesoo.yu@samsung.com> Reviewed-by: Vishal Moola (Oracle) <vishal.moola@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.